Mercurial > octave-nkf
annotate liboctave/DET.h @ 11542:695141f1c05c ss-3-3-55
snapshot 3.3.55
author | John W. Eaton <jwe@octave.org> |
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date | Sat, 15 Jan 2011 04:53:04 -0500 |
parents | fd0a3ac60b0e |
children | 12df7854fa7c |
rev | line source |
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8335 | 1 /* |
2 | |
11523 | 3 Copyright (C) 2008-2011 Jaroslav Hajek |
8335 | 4 |
5 This file is part of Octave. | |
6 | |
7 Octave is free software; you can redistribute it and/or modify it | |
8 under the terms of the GNU General Public License as published by the | |
9 Free Software Foundation; either version 3 of the License, or (at your | |
10 option) any later version. | |
11 | |
12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with Octave; see the file COPYING. If not, see | |
19 <http://www.gnu.org/licenses/>. | |
20 | |
21 */ | |
22 | |
23 #if !defined (octave_DET_h) | |
24 #define octave_DET_h 1 | |
25 | |
26 #include <cmath> | |
27 #include "oct-cmplx.h" | |
28 #include "lo-mappers.h" | |
29 | |
30 template <class T> | |
31 class | |
32 base_det | |
33 { | |
34 public: | |
35 | |
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parents:
9245
diff
changeset
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36 base_det (T c = 1, int e = 0) |
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parents:
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37 : c2 (), e2 () |
8335 | 38 { |
39 c2 = xlog2 (c, e2); | |
40 e2 += e; | |
41 } | |
42 | |
43 base_det (T c, double e, double b) | |
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44 : c2 (), e2 () |
8335 | 45 { |
46 e *= xlog2 (b); | |
47 e2 = e; | |
48 c *= xexp2 (e - e2); | |
49 int f; | |
50 c2 = xlog2 (c, f); | |
51 e2 += f; | |
52 } | |
53 | |
11505
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John W. Eaton <jwe@octave.org>
parents:
9245
diff
changeset
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54 base_det (const base_det& a) : c2 (a.c2), e2 (a.e2) { } |
8335 | 55 |
56 base_det& operator = (const base_det& a) | |
57 { | |
58 c2 = a.c2; | |
59 e2 = a.e2; | |
60 return *this; | |
61 } | |
62 | |
63 T coef (void) const { return c2; } | |
64 int exp (void) const { return e2; } | |
65 | |
66 T value () const { return c2 * static_cast<T> (std::ldexp (1.0, e2)); } | |
67 operator T () const { return value (); } | |
68 | |
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Jaroslav Hajek <highegg@gmail.com>
parents:
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diff
changeset
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69 base_det square () const { return base_det (c2*c2, e2+e2); } |
9813c07ca946
make det take advantage of matrix type
Jaroslav Hajek <highegg@gmail.com>
parents:
8335
diff
changeset
|
70 |
8335 | 71 void operator *= (T t) |
72 { | |
73 int e; | |
74 c2 *= xlog2 (t, e); | |
75 e2 += e; | |
76 } | |
77 | |
78 private: | |
79 | |
80 T c2; | |
81 int e2; | |
82 }; | |
83 | |
84 // Provide the old types by typedefs. | |
85 typedef base_det<double> DET; | |
86 typedef base_det<float> FloatDET; | |
87 typedef base_det<Complex> ComplexDET; | |
88 typedef base_det<FloatComplex> FloatComplexDET; | |
89 | |
90 #endif |